Three former law ministers have written to Rajasthan governor Kalraj Mishra amid an impasse over convening of the state Assembly session, saying the delay in doing so has resulted in an avoidable constitutional crisis.

In a letter to Mishra, senior Congress leaders and former law ministers Ashwani Kumar, Kapil Sibal and Salman Khurshid said the governor’s office, as envisaged under the country’s constitutional scheme, is above and beyond the constraints and compulsions of partisan politics, “so that its holder can act freely and fairly to uphold the Constitution”.

“Having served as Union ministers of Law and Justice in different periods of time and as students of Constitutional law, we are of the clear view that established legal position obliges the Governor to call the assembly session in accordance with the advice of the state cabinet.

“Any deviation from established constitutional position in the present circumstances would be an avoidable negation of your oath of office and will create a constitutional crisis,” the former law ministers said in the letter.

According to established conventions and the relevant articles of the Constitution, principles of parliamentary democracy and authoritative pronouncements of the Supreme Court, the governor is bound to act on the aid and advice of the council of ministers in the matter of convening the state Assembly, they added.

“We hope earnestly that true to the demands of your high office, you will not act in any manner that will countenance such a result,” they said.

Kumar said in a separate statement: “The unprecedented decision of the Rajasthan Governor to return for the second time, the proposal of the State Cabinet for convening a session of the State Assembly is patently unconstitutional and a clear transgression of gubernatorial powers....

“The Governor is expected to defer to the established constitutional position that binds him to act in accordance with the advice of the Council of Ministers. Failure to do so has led to a constitutional stalemate and has made the Governor’s position untenable.”

Mishra returned a cabinet note seeking an Assembly session to the Congress government in Rajasthan on Monday and sought additional information. This is the second time that the governor has returned the proposal and sought clarifications from the state government.

The Congress government in Rajasthan, which is facing a political crisis following a rebellion by the now sacked deputy chief minister Sachin Pilot and 18 other dissident MLAs, said it wanted the session to be held so that it can prove its majority.

Chief minister Ashok Gehlot has alleged that the governor is facing pressure “from above” to stall the Assembly from meeting, hinting at the alleged involvement of the BJP government at the Centre in the tussle for power in Rajasthan, a charge denied by the governor.